More than 15 percent of flights leaving BWI are delayed, according to the report. But the airport has increased its on-time departures so far this year compared to the same first six month of 2011. Dulles has a worse performance record with about 20 percent of flights are delayed.

On SkyTrax, an airline and airport review site, Dulles passengers ranked the airport a 3.9 out of a possible 10 points. The low rank was attributed to the probability that connecting flights require travelers switch to another terminal and to go through security again.

BWI faired better. Passengers gave the airport seven out of 10 points in part reflecting the limited dining options.